characterp
type: predicate function (subr) location: built-in source file: xlbfun.c Common LISP compatible: yes supported on: all machines
SYNTAX
(characterp <expr> )
<expr> - the expression to check
DESCRIPTION
The CHARACTERP predicate checks if an <expr> is a character. T is returned if <expr> is a character, NIL is returned otherwise.
EXAMPLES
(characterp #\a) ; returns T - character (setq a #\b) ; (characterp a) ; returns T - evaluates to char (characterp "a") ; returns NIL - string (characterp '(a b c)) ; returns NIL - list (characterp 1) ; returns NIL - integer (characterp 1.2) ; returns NIL - float (characterp 'a) ; returns NIL - symbol (characterp #(0 1 2)) ; returns NIL - array (characterp NIL) ; returns NIL - NIL